![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
With the rapid development of electronic technology and the continuous improvement of people's living standards, the demand for flexible electronic devices is increasing day by day. Flexible electronic technology requires electronic devices to have many new characteristics such as flexibility, stretchability, and biocompatibility. Liquid metal (Liquid Metal, LM) perfectly combines the liquid's deformability and the metal's conductivity, and has good chemical stability and excellent biocompatibility, making it an ideal flexible circuit material. However, the surface tension of LM is extremely high (such as gallium-indium alloy (including 74.5 wt% Ga and 25.5 wt% In), 624 mN m–1), which is difficult to process and difficult to compound with other substrates and other materials, which greatly limits the flexibility of LM Practical applications in the field of electronics.
The Bionic Intelligent Materials Research Group led by Li Zhaoxu, a researcher at the Qingdao Institute of Bioenergy and Processes, Chinese Academy of Sciences, prepared LM micro-nano droplets coated with alginate microgels by sonication of LM in an alginate solution. In the process of ultrasound, alginate can not only promote the reduction of particle size through the coordination of carboxyl group and Ga3 +, but also chelate Ga3 + to form a microgel, thereby inhibiting the further release of Ga3 + and improving the biocompatibility of the material. The LM dispersion coated with alginate microgel not only increases the colloidal stability and chemical stability, but also greatly increases its affinity with the flexible substrate, and can be used in electronic inks. Although the circuit composed of micro-nano droplets is insulated due to the outer layer of the oxide layer, its electrical conductivity can be restored by applying pressure (4.8 × 105 S m–1). This circuit can be applied to wearable microcircuits, electrothermal drivers and electronic skin (Figure 1). Related results have been published in "Advanced Functional Materials" (Adv. Funct. Mater. 2018, 28, 1804197).
Due to the presence of an oxide layer or stabilizer on the surface of the LM micro-nano droplets, the circuit deposited on it needs to be restored by external pressure, laser, high temperature and other treatments. These post-processing techniques not only consume energy, but also have many limitations in application. . The research team found through research that ultrasonic LM in aqueous dispersions of biomass nanofibers (Nanofibers, NFs) (eg, cellulose NFs, chitin NFs, silk NFs, etc.) can obtain stable dispersion of LM micro-nano droplets . Drying the dispersion at normal temperature and pressure, LM micro-nano droplets can be sintered into a continuous liquid metal conductive film (Figure 2). In-depth research shows that bio-based NFs may have three functions: first, bio-based NFs have rich hydrophilic groups (such as hydroxyl, carboxyl, etc.), which can be cross-linked with Ga3 + during ultrasound to reduce the The particle size and increase the colloidal stability of liquid metal droplets; second, bio-based NFs can generate a high capillary force during the evaporation process, which in turn destroys the outer shell of the LM micro-nano droplets; The adhesion of the large liquid metal layer to the substrate makes it stable to adhere to glass, polyethylene terephthalate (PET), styrene-ethylene-butene-styrene block copolymer (Styrene -ethylene-butene-styrene block copolymer (SEBS), polydimethylsiloxane (PDMS), oil paper and other materials. The film or coating material prepared based on evaporation and sintering has flexibility, high reflectivity, retractable conductivity (elongation up to 200%), good electromagnetic shielding effect, biodegradability and ultra-fast humidity, light, electricity With characteristics such as stimulus responsiveness, the evaporation and sintering method can be widely used in the fields of flexible electronics such as microcircuits, sensors, wearable devices and flexible robots. Related results were published in the recent "Nature-Communication" (Nat. Commun. 2019, 10, 3514).
The above research was supported by the National Natural Science Foundation of China (Nos. 21474125, 51608509), the Shandong Provincial Outstanding Youth Fund (Nos. JQ201609), the Shandong Provincial Doctoral Fund (ZR2016EEB25), and the 135th Key Cultivation Project of the Institute.
Figure 1. Alginate-assisted ultrasound preparation of LM nanodroplets and its application
Figure 2. Biomass NFs assisted ultrasound preparation of LM micro-nano droplets and sintering demonstration
Patterns can be customized according to customer's requirements. Dimming glass is also called "intelligent glass projection screen", which opens a new field of projection. Opaque state can replace the imaging curtain, used for projection, is the best choice for meeting, teaching. Etched Curtain Film technology has a variety of adhesives, but they generally fall into two categories: a dry and a sticky. In terms of architecture, dimmed glass has long broken away from the traditional presentation of door and window media. It can switch between transparency and opacity and instantly connect the separated space, realizing the mutual communication between Spaces, enhancing the sense of layers of space, breaking the boundaries of space, and having unique functional characteristics such as privacy protection. Environmental protection, clean and not easy to pollute, for us to create a healthy environment, it contains people's love and yearning for a beautiful life of nature. With the rich content of human life, the scenery and objects around give people a pleasant visual aesthetic feeling. Add a lot of fun to ordinary life.
UV Print Switchable Film,UV Print Glass Smart Film,UV Print Glass Dimming Film,UV Print Glass PDLC Film,UV Smart Film For Partition Door,UV PDLC Film For Partition Door
Tianqixun Technology , https://www.tqxdisplay.com